Electric-arc lamp.



PATEN-TBD JULY 7, 1908.

C. P. STEINMETZ. ELECTRIC ARG LAMP. APPLIOATION FILED MAY s1 INVENTOR.Charles P. iinrne by M my.'

UNITED. STATES .PATENT OFFICE.

cHARLRs If. 'sTEINMETa Or'seHENEcTADnNRW YORK, ,AssIGNoR To GENERALELECTRIC ooMPANn A CORPORATION. OF N Ew YORK.

'ELECTRIC-Ano LAMP specification f Letters raten-t; Application filedMay 31, 1902. Serial No.`109,600..

Patentedguly '1, 19'os., i

My present inventioncom risesl means for.

directing the deposition of so id matter emitted by luminous o'rfianing' electric arcs.- If

some such means asis hereinafter described is not employedf'the -s'o'lidmatter which is emitted' by' .arcs' of the --character mentioned, andwhich appearsin the formof smoke, is depositedI upon the inclosingglobe,-thereby forming 'a coating which obscures4 the light ,to agreater or less extent.` In accordance with my invention theA solidmatter is direct edaway from the arc-inclosing globe and is then removedor .eliminated fromy the air currents which carry it. Discoloration ofthe inclosing globe or globes is thus preventy ed and one of thedifficulties attendant u on the use of flaming arcs is thus remove Thenovel features which I believe are characteristic 'of my invention Ihave pointed out with articularity in the ap ended claims, whi efin the.followingspecl cation which is' to be takenin connection with theaccompanying drawings'.A will -be found a de'- tailed description'of oneyembodiment of the many which my invention may assume.

The arc lamprepresented in the drawings is intended for use o n constantpotential circuits and in the instance shown is of the shunt feedvariety, Vthat is to say, the electrodes of the lam are normally urgedapart bya spring or ot er mechanical device and are 'moved toward eachother through the o eration `of a vmagnet shunted about'the.

1e' ectro'des. y 4 In the drawings, l1 and 2 represent plates forming aportion'ot the framework of a lamp. These lates are separated from eachother and hel in place by means of 'spacing rods of which two areindicated at 3' and 4 respectively. The spaeebetwenthese plates is suchthat. when. inclosed by the cylindrical Acasing indicated in section at5,, a

f Stimm the maid -framework of the lamp ported centrall chamber ofmoderate dimensions is formed.

from which the working parts are supported, The lamp as' a whole'is,lsuspendedby a tubuJ lar extension 9 screwed into the top plate of thelamp and provided atits pro'ectmgend with a ring or other attachingevice.-

the drawings this tub'ul'arextens'ion is shown Y as partly broken vawayowing to lack of space to represent the full' ength of the extensininthe drawngs.- '1 'ff-5 Located centrally with respectI to,4 the' 35plates-land 2 is a tube'10 lconstituting'a guide for therod 11 whichcarries the upper electrode 12 of the lamp: -Thi's rod 11"i's actuatedby means off the solenoid 13 su in the lamp between t e 7b top` plate.8an -a cross piece 14 carried by thevertical supporting lrods 6' and 7.AVVith+' inthe-,opening 1n thissolenoid'is atub'ulai armature'or corev-15 of 'magnetic material in which slides the rodl 1-1.carrying"the"upper 75 electrode. To -the'lower portion of the core 15isv fastened a tubular member 1'6'of non-1 magnetic material 'carrying aclutch 2O ar-- r'anged to engage'the electrode rod 11' asin# dicatd at21. Y d

-The armature 15with all the artsattached thereto is sus endedfrom ai heical's'pring 17;

' the up eren 'of which is fastened at. the top of a tu e -18"havin aflange resting upon the top plate 8 of the amp as indicated'and sege"-cured in position by screws 19 or any other.

suitable means. A dash-pot or vdash-pots 22 may be used v'to preventt`oo violent motion of the'feleetrfode-'carrying rod 1 1 under vtheinilu'- ence of 'current iin the solenoid 13. .The 90 lower electrode-23is supported in'a holder2f carried by rods 25v depending 'from the.'lower plate 1 of the lamp frame.

The arc which'is formed between the e1ec'- trode's is jsurrounded by asmall inclosng .52 globe 26 O en at itsrlower end as indicated at 27 andmamtained with its up er ed e in close contact with the late 1 b libo'kewires y28 attached to the plate 1 he interior, of 'this interior? of.the'chamber '34 ,formed between .thlplates:.1.and.'.2'and the'cylindrical case ing 5, this communication being afforded means of asuitable number o Y openingsin the lower lplate 1, two of theseopeningsbein 105,` indicated at 29`in the'cross sectional View o turnsurrounded by a spherica or othersuit;v ably shaped Iouter` globe 30,the uppenedge the plate 1 from which it is supported as indicated.l

When the lamp is in operation the arc indicated at 31 heats the airimmediately surrounding it and this air rises through the set ofopenings 29 into the chamber 34, thereby producing a draft up throughthe opening 27 at the lower end of the inner arc-inclosing 4 This draftcauses air .to be draWn lobe. from the chamber 34 through suitableopenings, some of Which are indicated at 32, down into the outer globe30. The action described causes a continuous circulation'of air from theinner arc-inclosing globe up into the chamber 34, then down from thechamber vinto the inclosin lobe 30 and from thence into the inner incosing globe and so on. This directed circulation of heated air from theai'c permits the removal of solid matter emitted from the arc almost assoon as it is produced and for this purpose I make use of a series ofscreens 33 formed of Wire gauze of moderately small mesh, these screensbeing located yconcentrically in the chamber 34. In the drawingsthese'screens are indicated in cross section and as shown it' vwillreadily be seen that the air which is caused vto circulate by reason ofthe heating action of the arc is forced to pass through these screensbefore returning to the chamber formed between the inner and outerlglobes 26 and 30. The solid matter given of by the arc in the form ofsmoke or vapor is thus deposited in the meshes of the screens, therebypreventing its deposition u on the arc-inclosing globe, the effect ofWhic would of course be -to seriously reduce the amount of li httransmitted. l

Vhat I claim as new and desire to secure vby Letters Patent of theUnited States, is,

1. The' combination -in an electric arc lamp, of means for creatingWithin the lamp a circular air current carryingr smoke and and means fordepositing said products at a predetermined oint in the air circuit.

2. The com ination in an electricl arc lamp, of means for creatingWithin the lam a` circular air current carryin smoke and other productsof combustion from the arc, and a epositing chamber constituting apartof the air circuit. 3. The combination in an electric arc lamp, of meansfor creating Within the lamp a circular air current -carryin smokelandother roducts of combustion om the arc,l and a in the air circuit,

om the arc,

tering land depositing chamber With-l 4. The combination in an electricarc lamp, of lmeans for creating Within the lam a circular air currentcarrying smoke an other products of combustion from the arc, adepositing chamber constituting a part of the air "circuit, andfiltering and depositing i 6. The combination in an electric arc lamp,of an inclosinor globe7 means for creating through the glo e a circularair current carrying smoke and other products of combustion from the arcand globe, and means for depositin such products outside the globeWithin t e air circuit.

7. The combination in` an electric arc lamp, of an elongated arcinclosing globe, a chamber distinct from the globe communi- 'eating Withthe latter at its two ends for the deposition of smoke and otherproducts of combustion, and. means for causing a circular air currentthrough the globe and chamber.

8. The combination in van electric arc lamp of an elongated arcinclosing globe, a chamber distinct from the globe communieating withthe latter at its two ends for the deposition of smoke and otherproducts of combustion, means for causing a circular air current throughthe globe and chamber, and means contained in lthe chamber for promotingthe deposition of arc products in the same. l v

9. The combination in an electric arc lamp of apair ofelectrodes inaxial. alinement, an elon ated arc inclosing globe, and a chamber forepositing arc products of combustion in communication with the tWo endsof the elongated arc in closing globe.

10. In an arc lamp, the combination of means for, creating a recurrentcirculation of a coninedtbody ofair and arc products of combustion alonj and over the-arc, with a chamber remote from the arc through which thesaid circulation passes, for depositing products' of-jvcoinbustion.

In witness whereof I have hereun to met my hand this 28th day `of May,1902.

i CHARLES' P. STEINMETZ.

" Witnesses BENJAMiN B. HULL,

HELEN ORroRn.

